{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T18:48:32.821Z","years_from_j2000":26.678,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, and the result is referred to the true equator and equinox of this instant. Those are separate things: the motion moves the object, and the rotation turns the grid under it by about fifty arcseconds a year, with nutation adding up to another seventeen.","excluded":"Parallax, the radial-velocity perspective term, aberration and refraction; each is below the accuracy of the catalogued positions themselves. An object with no published proper motion comes back where the catalogue has it rather than at a fabricated zero, and says so with a null pm_ra_mas_yr. A body with no fixed position is not propagated at all — its place comes from an ephemeris, which is what /api/v1/visible answers with."},"slug":"hd-89307-b","name":"HD 89307 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":104.40396113264042,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":154.5874958,"dec_deg":12.6209392,"epoch_ra_deg":154.94632,"epoch_dec_deg":12.486643,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 89307","semi_major_axis_km":489185037.18899995,"periapsis_km":null,"mass_kg":3.8342116915085754e+27,"mass_msun":0.00192828,"constellation":"Leo","discovered":"2009","featured":false,"url":"https://spacecatalog.org/object/hd-89307-b","radius_km":85466.54000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 89307","host_v_mag":7.02569,"eccentricity":0.2,"uncertainties":{"mass_kg":[2.8471868996350808e+26,5.124936419343146e+26],"distance_ly":[0.17155825467900704,0.17221056743444052],"eccentricity":[0.05,0.05],"host_mass_solar":[0.12,0.12],"inclination_deg":[15,13],"host_radius_solar":[0.01,0.01],"host_temperature_k":[14,14],"semi_major_axis_km":[10471850.949000001,10471850.949000001],"orbital_period_days":[38,38],"argument_of_periastron_deg":[33,33]},"host_mass_solar":1.27,"inclination_deg":72,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.1,"planets_in_system":1,"discovery_facility":"Lick Observatory","host_spectral_type":"G0 V","host_temperature_k":5955,"orbital_period_days":2166,"periastron_epoch_bjd":2450228,"equilibrium_temperature_k":166.55,"argument_of_periastron_deg":14},"designations":[{"catalog":"Exoplanet","designation":"HD 89307 b"},{"catalog":"Host star","designation":"HD 89307"}],"source":{"id":"exoplanet_archive","name":"NASA Exoplanet Archive (Planetary Systems Composite Parameters)","url":"https://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=PSCompPars","license":"Public domain (NASA)"},"updated_at":"2026-09-02T19:50:56.720Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}